Secondary tumours. Coloured frontal X-ray of secondary tumours (white spots) in the pelvis of a patient. The spine is seen at top centre and the femurs (thigh bones) are at bottom right and left. These malignant (cancerous) tumours have metastasised (spread) from the site of the primary cancer, in this case a thyroid cancer. Treatment is with surgical removal of the tumours, and radioactive iodine therapy.